JP6926908B2 - Rotor manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a rotor.

Conventionally, a method for manufacturing a rotor in which a permanent magnet is adhered to a rotor core by an adhesive is known (see, for example, Patent Document 1).

Patent Document 1 discloses a method for manufacturing a rotor in which a melted adhesive is dropped onto the surface of a permanent magnet by a dispenser. In this method of manufacturing a rotor, the adhesive dropped on the surface of a permanent magnet is pressed by a press machine equipped with a heater. The pressing force of this press causes the adhesive to be formed into a sheet. Then, after the permanent magnet on which the adhesive is arranged is arranged in the accommodating groove of the rotor core, the adhesive is cured to fix the permanent magnet in the accommodating groove of the rotor core.

Japanese Unexamined Patent Publication No. 2007-151362

However, in Patent Document 1, since the adhesive is formed into a sheet using a press machine, a press machine is required. Therefore, in the above-mentioned Patent Document 1, there is an inconvenience that the rotor manufacturing equipment becomes large.

Therefore, in order to prevent the rotor manufacturing equipment from becoming large, an adhesive having a volatile agent is applied to the surface (coated surface) of the permanent magnet without using a press machine, and the volatile agent of the adhesive is applied. It is conceivable to form the adhesive into a sheet by volatilizing and drying the adhesive to reduce the thickness.

However, as a result of diligent studies by the inventor of the present application on a method for manufacturing a rotor without using the press machine, when the adhesive is dried after the adhesive is applied to the coated surface so that the thickness of the adhesive is substantially uniform. , The thickness of the coating end portion consisting of the coating start end portion of the adhesive and the coating end portion of the adhesive is larger than the thickness of the coating center portion between the coating start end portion and the coating end portion. There was found. That is, it was found that even if the adhesive was applied to the coated surface so that the thickness was uniform, the thickness of the coated end portion and the thickness of the coated central portion were not uniform in the dried adhesive. Therefore, there is a problem that it is difficult to prevent the thickness of the adhesive from becoming uneven while preventing the manufacturing equipment from becoming large in size. For example, due to the non-uniform thickness (the thickness of the coated end is relatively large), when the permanent magnet is placed (inserted) in the accommodating groove (magnet hole) of the rotor core, the adhesive may be different. It is considered that the possibility of interfering with the member increases. Further, when an adhesive containing a leavening agent is used, after the leavening agent expands, the pressing force generated between the permanent magnet and the rotor core at the coated end of the adhesive becomes larger than necessary. Conceivable.

The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to prevent the thickness of the adhesive from becoming uneven while preventing the manufacturing equipment from becoming large in size. It is to provide a method of manufacturing a rotor which can be done.

In order to achieve the above object, the method for manufacturing a rotor in one aspect of the present invention includes a rotor core having a hole for a magnet and a permanent magnet arranged in the hole for the magnet and adhered to the rotor core with an adhesive. A method for manufacturing a rotor to be provided, which is a method of applying an adhesive containing a volatile agent to a coated surface to which an adhesive of a permanent magnet or a rotor core is applied, and after a step of applying the adhesive, a curing temperature of the adhesive. After the steps of volatilizing at least part of the adhesive's volatiles to dry the adhesive by heating the adhesive at a temperature below, and the steps of drying the adhesive, a permanent magnet is placed in the hole for the magnet. After the step of arranging the permanent magnet and the step of arranging the permanent magnet, the step of applying the adhesive includes a step of curing the adhesive, and the step of applying the adhesive includes a coating start end including a position where the application of the adhesive is started and the adhesive. The first coating thickness in the direction orthogonal to the coating surface of the coating end portion consisting of the coating end portion including the position where the coating of the above is finished is the adhesive portion between the coating start end and the coating end end. to be smaller than the second coating thickness is coated central portion, Ri step der applying an adhesive coated surface and the coated surface of the permanent magnet and the nozzle, the nozzle having a discharge port for discharging the adhesive With the coating device including the moving mechanism unit that moves with respect to the coating surface, the coating end is arranged at a position that is the first distance corresponding to the coating surface and the first coating thickness in the direction orthogonal to the coating surface. The adhesive is applied to the coating surface corresponding to the portion, and the nozzle is arranged at a position at a second distance corresponding to the coating surface and the second coating thickness in the direction orthogonal to the coating surface, and the coating center portion. The step of applying the adhesive to the coated surface corresponding to the above, and the step of drying the adhesive reduces the first coating thickness of the coated end by the first reduction amount by volatilizing the volatile agent of the adhesive. By doing so, the thickness is changed to the thickness after the first drying, and the second coating thickness at the center of the coating of the adhesive is reduced by a second reduction amount larger than the first reduction amount, so that the second thickness is equivalent to the first drying thickness. This is a step of changing the thickness after drying .

In the method for manufacturing a rotor according to one aspect of the present invention, by configuring as described above, the thickness of the coated end portion (first coated thickness) is previously set to the thickness of the coated central portion before the step of drying the adhesive. It can be made smaller than (second coating thickness). As a result, in the step of drying the adhesive, the amount of decrease in the thickness of the coating end portion is larger than the amount of reduction in the thickness of the coating center portion, which is the portion of the adhesive between the coating start end portion and the coating end portion. Since it becomes smaller, the difference between the thickness of the coating end portion and the thickness of the coating center portion can be reduced. As a result, in the dried adhesive, it is possible to prevent the thickness of the coated end portion and the thickness of the coated central portion from becoming non-uniform as much as possible. Further, in the present invention, by providing the step of drying the adhesive, the adhesive applied in a state where non-uniform thickness is prevented as much as possible can be thinned into a sheet, so that the adhesive can be thinned. There is no need for a press machine to heat-mold the sheet. As a result, it is possible to prevent the thickness of the adhesive from becoming uneven while preventing the rotor manufacturing equipment from becoming large in size. Further, since the thickness of the adhesive is prevented from becoming uneven, it is possible to prevent the adhesive from interfering with the rotor core or the permanent magnet when the permanent magnet is inserted into the magnet hole of the rotor core. can.

According to the present invention, it is possible to prevent the thickness of the adhesive from becoming uneven while preventing the rotor manufacturing equipment from becoming large in size.

It is sectional drawing of the rotary electric machine (rotor) by 1st Embodiment of this invention. It is a perspective view of the rotor according to 1st Embodiment of this invention. It is a side view which shows the structure of the permanent magnet and the adhesive by 1st Embodiment of this invention. FIG. 5 is a partial plan view showing a state in which the permanent magnet and the rotor core according to the first embodiment of the present invention are bonded by an adhesive. It is sectional drawing which shows typically the state before and after expansion of the adhesive by 1st Embodiment of this invention. It is a conceptual diagram which shows the structure of the adhesive by 1st Embodiment of this invention. It is a partial plan view which shows the state which the permanent magnet is inserted in the rotor core by 1st Embodiment of this invention. It is a figure for demonstrating the relationship of the thickness before and after drying of the adhesive by 1st Embodiment of this invention. It is a top view of the rotor coating apparatus according to 1st Embodiment of this invention. It is a perspective view of the 3-axis Cartesian robot according to 1st Embodiment of this invention. It is sectional drawing of the plunger pump by 1st Embodiment of this invention. It is a figure which shows the discharge port and the extension part of the nozzle by 1st Embodiment of this invention. It is a flowchart which shows the manufacturing process by 1st Embodiment of this invention. It is a figure which shows the change of the thickness and temperature of the adhesive in the manufacturing process by 1st Embodiment of this invention. It is a figure which shows the step of applying the adhesive by 1st Embodiment of this invention. It is a figure for demonstrating the distance between the nozzle and the surface of a permanent magnet according to 1st Embodiment of this invention. It is a figure for demonstrating the structure of the extension part of the nozzle by 1st Embodiment of this invention. It is a figure for demonstrating the composition of the applied adhesive by 1st Embodiment of this invention. It is a figure for demonstrating the process of arranging the permanent magnet in the magnet hole part by 1st Embodiment of this invention. It is a figure for demonstrating the manufacturing method of the rotor by a comparative example. It is a figure for demonstrating the measurement result of the thickness of the adhesive formed by the manufacturing method of a rotor by a comparative example. It is a figure for demonstrating the measurement result of the thickness of the adhesive formed by the method of manufacturing the rotor of 1st Embodiment of this invention. It is a figure for demonstrating the manufacturing method of the rotor according to 2nd and 3rd Embodiment of this invention. It is a figure for demonstrating the moving speed of a nozzle by 2nd Embodiment of this invention. It is a figure for demonstrating the coating amount of the adhesive by 3rd Embodiment of this invention. It is a figure for demonstrating the manufacturing method of the rotor by the modification of 1st to 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
(Rotor structure)
The structure of the rotor 100 according to the first embodiment will be described with reference to FIGS. 1 to 8.

In the specification of the present application, the "rotational axis direction" or "axial direction" means the rotation axis direction of the rotor 100 (direction along axis C1 (see FIG. 2); arrow A direction in FIG. 1). Further, the "circumferential direction" means the circumferential direction of the rotor 100 (the arrow B1 direction and the arrow B2 direction in FIG. 2). Further, "diameter inside" means the inner diameter side of the rotor 100 (arrow E1 direction side), and "diameter outside" means the outer diameter side of the rotor 100 (arrow E2 direction side).

As shown in FIG. 1, the rotor 100 is, for example, a part of an embedded permanent magnet type motor (IPM motor: Interior Permanent Magnet Motor) in which a plurality of permanent magnets 1 are arranged inside the rotor 100 (rotary electric machine 101. Part). The rotary electric machine 101 is configured as, for example, one of a motor, a generator, and a motor generator having the functions of both the motor and the generator. For example, the rotary electric machine 101 is configured as a traveling motor used in a hybrid vehicle or an electric vehicle.

Further, the rotor 100 is arranged inside the stator 102 in the radial direction so as to face the stator 102 in the radial direction. That is, the rotary electric machine 101 is configured as an inner rotor type rotary electric machine. Further, as shown in FIG. 1, the rotor 100 includes a permanent magnet 1, a hub member 2, a rotor core 3, an adhesive 4, and an end plate 5. The rotor 100 is fixed to a hub member 2 connected to a shaft, and is configured to transmit (or transmit) rotational motion to the outside of the rotary electric machine 101 via the hub member 2 and the shaft.

As shown in FIG. 3, the permanent magnet 1 is formed so as to have a substantially rectangular shape having a length L1 in the axial direction and a width W1 smaller than the length L1 when viewed from the inside in the radial direction. For example, as shown in FIG. 4, the permanent magnet 1 has a substantially rectangular shape in which two corners on the outer side in the radial direction are chamfered when viewed from one side in the axial direction (viewed in the direction of arrow A). The permanent magnet 1 is configured such that the surface 11 on the inner side in the radial direction is a flat surface and the surface 12 on the outer side in the radial direction has an arc shape when viewed from one side in the axial direction. The surface 11 is an example of a “coated surface” within the scope of the claims.

Further, each of the two chamfered corners of the permanent magnet 1 is provided with a surface 13 as an abutting surface that abuts on the magnet hole portion 32 described later. The two surfaces 13 of the permanent magnet 1 are arranged so as to abut (surface contact) with the wall surface 32a of the magnet hole portion 32, respectively. That is, the permanent magnet 1 is fixed in a state of being positioned by the wall surface 32a having a pair of tapered shapes when viewed in the direction of the arrow A.

As shown in FIG. 1, the hub member 2 is fixed to the rotor core 3. Further, the hub member 2 is fixed to a shaft (not shown). The hub member 2, the rotor core 3, and the shaft are configured to rotate integrally with the shaft C1 as the central axis.

As shown in FIG. 2, the rotor core 3 includes, for example, a plurality (for example, four) core blocks 30 having an annular shape. The plurality of core blocks 30 are stacked in the axial direction with the central axes C1 aligned with each other. Each of the core blocks 30 is formed by laminating a plurality of electromagnetic steel sheets 31 having an annular shape (see FIG. 1; for example, silicon steel sheets) in the axial direction.

Then, as shown in FIG. 2, the core block 30 is provided with a plurality of (for example, 16) hole portions 132 configured as through holes along the axial direction. Further, the plurality of core blocks 30 are laminated in the axial direction so that the positions of the holes 132 overlap (or completely coincide with each other) when viewed in the direction of arrow A. As a result, in the rotor core 3, the hole portions 132 of the plurality of core blocks 30 are continuously connected to form the magnet hole portion 32 into which the permanent magnet 1 is inserted along the axial direction. Further, the plurality of magnet hole portions 32 are arranged at equal angular intervals in a circumferential shape when viewed in the direction of arrow A. A permanent magnet 1 is arranged in each of the plurality of magnet holes 32. As shown in FIG. 1, the magnet hole 32 and the permanent magnet 1 are adhered to each other by an adhesive 4 and are fixed to each other.

Further, as shown in FIG. 4, the magnetic hole portion 32 is provided with the adhesive 4 and two groove portions 32b extending in the radial direction of the rotor core 3 and extending in the axial direction. There is. Specifically, the two groove portions 32b are provided in the vicinity of both ends in the circumferential direction of the magnet hole portion 32, and the protruding portion 32c is provided between the two groove portions 32b. In other words, the protruding portion 32c of the rotor core 3 is configured to project from the radially inner side to the radial outer side of the magnet hole portion 32 at the central portion in the circumferential direction of the magnet hole portion 32. Each of the two groove portions 32b has a bottom portion 32d, and the groove depth d1 from the top surface 32e to the bottom portion 32d of the protrusion 32c is larger than the thicknesses t1 and t2 (see FIG. 7) described later, and is thick. It is configured to be t3 or less. The thickness t1 is an example of the "thickness after the first drying" in the claims. Further, the thickness t2 is an example of the "thickness after the second drying" in the claims.

As shown in FIG. 4, the adhesive 4 is arranged in contact with a part of the radial inner surface 11 of the permanent magnet 1. For example, as shown in FIG. 3, the adhesive 4 is arranged on two portions of the surface 11 of the permanent magnet 1 on one side (arrow B1 direction side) and the other side (arrow B2 direction side) in the lateral direction. ing. The adhesive 4 is formed so as to extend in the longitudinal direction (axial direction) of the surface 11 of the permanent magnet 1. Specifically, the adhesive 4 has a length L2 in the longitudinal direction and a width W2 in the lateral direction.

Further, as shown in FIG. 5B, the adhesive 4 is a foaming agent in a foamed state in a state where the permanent magnet 1 and the rotor core 3 are adhered by the adhesive 4 (the state in which the rotor 100 is completed). 41 and a cured main agent 42 and a curing agent 43 are included. The foaming agent 41 is an example of a "swelling agent" within the scope of the claims.

The foaming agent 41 is configured as a leavening agent that foams (expands) when heated to a temperature equal to or higher than the expansion temperature T1. Further, the main agent 42 and the curing agent 43 have a property of reacting with each other and curing by being heated to a temperature of the curing temperature T2 or higher, which is higher than the expansion temperature T1. That is, the adhesive 4 is configured as a thermosetting adhesive.

Specifically, as shown in FIG. 6, the foaming agent 41 is configured as a capsule body, and is configured so that the capsule body expands and increases in volume when heated to a temperature equal to or higher than the expansion temperature T1. Has been done. For example, isopentane or the like can be used as the foaming agent 41. Further, the expansion temperature T1 can be set as, for example, the foam molding temperature at which the capsule body is foam molded.

Then, as shown in FIG. 5, as the foaming agent 41 foams and expands, the thickness t1 of the coating start end portion 141 and the coating end portion 142 of the adhesive 4 and the thickness t2 of the coating center portion 143 become thick. The thickness changes to t3, which is larger than t1 and t2. As a result, the adhesive 4 is arranged from the surface 11 of the permanent magnet 1 to the bottom 32d of the groove 32b. Further, the foaming agent 41 remains as an expanded capsule in the adhesive 4 (inside the magnet hole 32) even after heating. Further, in the first embodiment, the thickness t1 and the thickness t2 have the same size. In addition, "equivalent" means a concept including "substantially the same" and "substantially the same", and there is variation in the case of manufacturing by the manufacturing method of the rotor 100 according to the first embodiment described later (FIG. 22). Within the range of the variation width e2), it means “equivalent”.

Then, preferably, the adhesive 4 changes to a thickness t3 that is 3 times or more and 8 times or less the thickness t1 (and t2) of the adhesive 4 before expansion as the foaming agent 41 foams and expands. , The content ratio of the foaming agent 41 in the adhesive 4 is set. Then, as shown in FIG. 7, in the state before the foaming agent 41 of the adhesive 4 is foamed, the adhesive 4 and the bottom portion 32d of the groove portion 32b are arranged at positions separated from each other, and the permanent magnet 1 is used. The surface 13 and the wall surface 32a of the magnet hole 32 are arranged at positions separated from each other. Then, in the state after the foaming agent 41 of the adhesive 4 is foamed (see FIG. 4), the adhesive 4 expands, the adhesive 4 comes into contact with the bottom portion 32d of the groove portion 32b, and the permanent magnet 1 has a diameter. Pressed outward in the direction, the surface 13 of the permanent magnet 1 and the wall surface 32a of the magnet hole 32 are arranged at positions where they come into contact with each other.

The main agent 42 contains, for example, an epoxy resin (for example, a bisphenol A type liquid epoxy and an epoxy resin polymer). The curing agent 43 also contains, for example, dicyandiamide. Then, the permanent magnet 1 and the rotor core 3 are adhered and fixed by curing the main agent 42 and the curing agent 43 of the adhesive 4. Further, the curing temperature T2 is higher than the drying temperature T3 described later and higher than the expansion temperature T1. Further, the curing temperature T2 is set by the combination of the main agent 42 and the curing agent 43, and is lower than the product upper limit temperature T5. Further, the product upper limit temperature T5 can be set, for example, as a temperature that does not affect the performance of the rotor 100.

Further, as shown in FIG. 6, the adhesive 4 is used as a volatile agent before the permanent magnet 1 and the rotor core 3 are adhered by the adhesive 4 and before being dried. It contains a diluting solvent 44, a foaming agent 41 as a leavening agent in a state before foaming, and a main agent 42 and a curing agent 43 in an uncured state. Further, the adhesive 4 contains a foaming agent 41 in a state after being dried (see FIG. 5A), and a main agent 42 and a curing agent 43 in an uncured state. That is, after the adhesive 4 is dried, the amount of the diluting solvent 44 in the adhesive 4 is reduced, or the diluting solvent 44 in the adhesive 4 is not substantially contained.

As the diluting solvent 44, for example, ketones such as methyl ethyl ketone and volatile organic solvents such as alcohols and ethers can be used, and preferably both methyl ethyl ketone and ethyl acetate are contained. The diluting solvent 44 has a function of increasing the fluidity of the adhesive 4 by being contained in the adhesive 4.

Further, the diluting solvent 44 volatilizes when the drying temperature is set to T3 or higher (for example, the temperature T10 in FIG. 14). Here, as the drying temperature T3, for example, the boiling point temperature of the diluting solvent 44 or a temperature near the boiling point temperature can be set. Further, the drying temperature T3 is lower than the expansion temperature T1. Further, the expansion temperature T1 is lower than the curing temperature T2. As a result, by setting the temperature of the adhesive 4 to a temperature lower than the expansion temperature T1 and a temperature equal to or higher than the drying temperature T3, the diluting solvent 44 can be volatilized without expanding the foaming agent 41.

As shown in FIG. 8, the coating start end portion 141 and the coating end portion 142 of the adhesive 4 have a thickness t11 in the direction orthogonal to the surface 11 (in the direction of arrow Z1 and the direction of arrow Z2) in the state before being dried. Has. Further, the coating central portion 143, which is a portion between the coating start end portion 141 and the coating end portion 142 of the adhesive 4, has a thickness t12 in a direction perpendicular to the width direction of the permanent magnet 1 in a state before being dried. Has. In the first embodiment, the thickness t11 is smaller than the thickness t12. The thickness t11 is an example of the "first coating thickness" in the claims. Further, the thickness t12 is an example of the "second coating thickness" in the claims. Further, FIG. 8 emphasizes the difference in order to explain the magnitude of the thickness of the adhesive 4, and the relationship between the thicknesses of the adhesive 4 is not limited to the example of FIG.

The coating start end portion 141 and the coating end portion 142 have, for example, a length L3 in the longitudinal direction (coating direction) of the adhesive 4, and are a portion in the longitudinal direction of the adhesive 4 and a portion in the vicinity of the end portion. .. The coating central portion 143 has, for example, a length L4 larger than the length L3 in the longitudinal direction (coating direction) of the adhesive 4, and is a portion between the coating start end portion 141 and the coating end portion 142.

Then, the volume of the adhesive 4 is reduced and the adhesive 4 is thinned by volatilizing the diluting solvent 44. That is, in the state after being dried, the coating start end portion 141 and the coating end portion 142 have a thickness t1 smaller than the thickness t11. That is, the thickness of the coating start end portion 141 and the coating end portion 142 is reduced from the thickness t11 to the thickness t1 by the first reduction amount R1. Further, the thickness of the coating central portion 143 is reduced from the thickness t12 to the thickness t2 by the second reduction amount R2. The first reduction amount R1 is smaller than the second reduction amount R2.

[Structure of Adhesive Coating Device According to First Embodiment]
Next, the structure of the adhesive 4 coating device 201 according to the first embodiment will be described.

As shown in FIGS. 9 and 10, the coating device 201 includes a plunger pump 211. The plunger pump 211 houses the adhesive 4 containing the diluting solvent 44 inside. Further, the plunger pump 211 is attached to the 3-axis Cartesian robot 212. The 3-axis Cartesian robot 212 is configured to move the plunger pump 211 relative to the permanent magnet 1. Specifically, the 3-axis Cartesian robot 212 is configured to be able to move the plunger pump 211 in the horizontal direction (XY direction) and the vertical direction (Z direction). The 3-axis Cartesian robot 212 is an example of the "moving mechanism unit" in the claims. Further, in the specification of the present application, the direction orthogonal to the surface 11 is defined as the Z direction, the moving direction of the nozzle 213 (the coating direction of the adhesive 4) is defined as the Y direction, and the directions orthogonal to the Z direction and the Y direction are defined as the X direction. do.

As shown in FIG. 11, the plunger pump 211 is provided with a nozzle 213. The nozzle 213 is arranged adjacent to the discharge port 213a for discharging the adhesive 4 and the discharge port 213a in the direction (X direction) orthogonal to the moving direction (Y direction) of the nozzle 213, and the discharge port 213a. And the stretched portion 213b formed substantially flush with each other. Further, the nozzle 213 includes a flat portion 213c formed substantially flush with the extending portion 213b and arranged adjacent to the discharge port 213a in the direction in which the nozzle 213 moves.

As shown in FIG. 12, specifically, the discharge port 213a has a substantially rectangular shape with the X direction as the longitudinal direction when viewed in the Z direction. For example, the discharge port 213a has a length L11 in the X direction and a width W11 in the Y direction. The shape of the discharge port 213a is not limited to the above shape, and can be appropriately selected from a substantially triangular shape, a substantially rectangular shape, a substantially square shape, another polygonal shape, a substantially circular shape, and a substantially elliptical shape. A substantially rectangular shape is preferable for adjusting the coating amount.

The stretched portion 213b is formed as, for example, a flat surface, and is arranged substantially parallel to the surface 11 of the permanent magnet 1. The stretched portion 213b has a function of stretching the adhesive 4 discharged from the discharge port 213a in the X direction. That is, the stretched portion 213b is arranged so as to come into contact with the surface of the adhesive 4.

Then, in the X direction, the length L12 of the stretched portion 213b is smaller than the length L11 of the discharge port 213a. Further, the length L12 of the stretched portion 213b is larger than the length L13 of the flat portion 213c in the Y direction. For example, the length L12 is set to be less than half of the length L11 and more than one-fifth. By setting the length L12 to one-half or less of the length L11, while suppressing interference with other jigs of the coating device 201, by setting it to one-fifth or more, the adhesive 4 It is possible to secure the length required to stretch the.

Further, as shown in FIG. 11, the plunger pump 211 includes a rod-shaped plunger 211a that pushes out the adhesive 4, and a cylindrical accommodating member 211b in which the rod-shaped plunger 211a is housed. A moving wall portion 211c is provided on the side surface portion of the cylindrical accommodating member 211b, and a moving wall portion 211d is provided on a portion on the tip end side of the accommodating member 211b. The moving wall portion 211c is provided between the adhesive tank portion 214 in which the adhesive 4 is accommodated and the internal space of the accommodating member 211b. The moving wall portion 211d is provided between the nozzle 213 and the internal space of the accommodating member 211b.

Then, the moving wall portion 211c moves, the internal space of the accommodating member 211b and the adhesive tank portion 214 are connected, and the moving wall portion 211d closes the portion on the tip end side of the accommodating member 211b. In this state, the plunger 211a is moved toward the Z1 direction by a predetermined distance, so that a predetermined fixed amount of the adhesive 4 is sucked into the cylindrical accommodating member 211b. After that, the moving wall portion 211c moves, and the moving wall portion 211d closes the side surface portion of the accommodating member 211b, and the moving wall portion 211d moves to move the internal space of the accommodating member 211b and the nozzle 213. By moving the plunger 211a toward the Z2 direction by a predetermined distance in the connected state, the adhesive 4 having a set discharge amount is applied to the surface 11 of the permanent magnet 1. In the first embodiment, the coating device 201 is configured (commanded) so that a constant amount of the adhesive 4 discharged per unit time is discharged from the discharge port 213a to the surface 11 of the permanent magnet 1.

Further, as shown in FIG. 9, the coating device 201 includes a pallet 215 on which a plurality of permanent magnets 1 are placed. FIG. 9 shows an example in which six permanent magnets 1 are placed on one pallet 215, but the number of permanent magnets 1 is not limited to this. Further, a plurality of pallets 215 are provided. Further, the plurality of pallets 215 are sequentially moved below the plunger pump 211 by the conveyor 216. The coating device 201 is configured so that the adhesive 4 can be sequentially applied to the permanent magnets 1 placed on the plurality of pallets 215.

[Rotor manufacturing method according to this embodiment]
Next, a method of manufacturing the rotor 100 according to the present embodiment will be described. FIG. 13 shows a flowchart of a method for manufacturing the rotor 100 according to the present embodiment. Further, in FIG. 14, the horizontal axis is time, and the vertical axis is the temperature of the adhesive 4 (vertical axis on the left side) and the thickness of the adhesive 4 (vertical axis on the right side) during the manufacturing process of the rotor 100 (step S1). The figure for demonstrating the state of the adhesive 4 of ~ S4) is shown.

<Process of applying adhesive>
In step S1, a step of applying the adhesive 4 to the permanent magnet 1 and arranging the adhesive 4 is performed. Specifically, in the first embodiment, the foaming agent 41 as an expansion agent that expands when heated to a temperature equal to or higher than the expansion temperature T1, the volatile diluting solvent 44, and the temperature higher than the expansion temperature T1 An adhesive 4 (see FIG. 6) containing a main agent 42 and a curing agent 43 that are cured by being heated to a certain curing temperature T2 or higher is placed on a pallet 215 with a plurality of permanent magnets 1 (FIG. 9). The adhesive 4 is applied to the surface 11 of (see).

Specifically, as shown in FIG. 15, in the first embodiment, the surface 11 of the coating start end portion 141 including the position P1 where the coating of the adhesive 4 is started, and the coating of the adhesive 4 are completed. The thickness t11 in the direction orthogonal to the surface 11 of the coating end portion 142 including the position P4 is the thickness t12 of the coating central portion 143 which is the portion of the adhesive 4 between the coating start end portion 141 and the coating end end portion 142. The adhesive 4 is applied by the coating device 201 so as to be smaller than the above.

Further, as shown in FIG. 8, in the first embodiment, in the state where the adhesive 4 is dried, the thickness t1 of the coating start end portion 141 and the coating end portion 142 is equivalent to the thickness t2 of the coating center portion 143. The coating start end portion 141 and the coating are applied so that the thickness t11 corresponds to the difference between the first reduction amount R1 from the thickness t11 to the thickness t1 and the second reduction amount R2 from the thickness t12 to the thickness t2. The adhesive 4 is applied to the surface 11 corresponding to the end end portion 142 by the coating device 201.

Specifically, as shown in FIGS. 15 and 16, in the first embodiment, the nozzle 213 having the discharge port 213a (see FIG. 12) for discharging the adhesive 4 and the nozzle 213 are placed on the surface 11 of the permanent magnet 1. The coating device 201 including the 3-axis Cartesian robot 212 that moves the nozzle 213 with respect to the surface 11 (position) with the nozzle 213 arranged at a position at the first distance d11 corresponding to the surface 11 and the thickness t11 in the Z direction. The adhesive 4 is applied from P1 to position P2 and from position P3 to position P4), and the nozzle 213 is arranged at a position at a second distance d12 corresponding to the surface 11 and the thickness t12 in the Z direction. In this state, the adhesive 4 is applied to the surface 11 (from position P2 to position P3).

Further, in the first embodiment, the adhesive 4 is adhered to the surface 11 in a state where the discharge amount of the adhesive 4 from the discharge port 213a is constant and the moving speed in the direction along the surface 11 of the nozzle 213 is constant. Agent 4 is applied. That is, in the first embodiment, the thickness of the adhesive 4 is adjusted by the distance (clearance) between the nozzle 213 and the surface 11.

Specifically, the nozzle 213 is arranged at a position facing the Z direction of the position P1 of the surface 11 of the permanent magnet 1. At this time, the tip end portion (discharge port 213a) of the nozzle 213 is arranged at a position where the distance from the surface 11 in the Z direction is the first distance d11. Then, in the first embodiment, the adhesive 4 is adhered to the surface 11 in a state where the discharge amount of the adhesive 4 from the discharge port 213a is constant and the moving speed in the direction along the surface 11 of the nozzle 213 is constant. Agent 4 is applied from position P1 to P2 (length L3). As a result, the coating start end portion 141 having the thickness t11 corresponding to the first distance d11 is formed. The thickness t11 corresponding to the first distance d11 means that the first distance d11 has substantially the same size as the thickness t11, and the adhesive is in a state where the nozzle 213 and the applied adhesive 4 are in close proximity to each other. 4 is shown to be applied.

Then, at the position P2, the nozzle 213 is in a state where the discharge amount of the adhesive 4 from the discharge port 213a is constant and the moving speed in the direction along the surface 11 of the nozzle 213 is constant. It is moved to a position where the distance from 11 in the Z direction is the second distance d12, which is larger than the first distance d11. Then, the coating is continued in a state where the nozzle 213 and the surface 11 are at the second distance d12, and the coating central portion 143 having the thickness t12 corresponding to the second distance d12 is formed from the positions P2 to P3 (length L4). Will be done.

Then, at the position P3, the nozzle 213 is in a state where the discharge amount of the adhesive 4 from the discharge port 213a is constant and the moving speed in the direction along the surface 11 of the nozzle 213 is constant. It is moved to a position where the distance from 11 in the Z direction becomes the first distance d11. Then, the coating is continued in a state where the nozzle 213 and the surface 11 are at the first distance d11, and the coating end end 142 having the thickness t11 corresponding to the first distance d11 is formed from the position P3 to P3 (length L3). It is formed. Then, at the position P4, the application of the adhesive 4 from the nozzle 213 is completed.

Here, as shown in FIG. 17, in the first embodiment, when forming the coating start end portion 141 and the coating end end portion 142 in a state where the nozzle 213 and the surface 11 are arranged at the positions where the first distance d11 is formed. In addition, the stretched portion 213b applies the adhesive 4 to the surface 11 while causing the applied adhesive 4 to protrude in the direction intersecting the moving direction of the nozzle 213.

Specifically, as shown in FIG. 18, the adhesive 4 discharged from the discharge port 213a of the nozzle 213 spreads in the X direction between the stretched portion 213b and the surface 11, so that the coating start end portion 141 A protruding portion 141a and a protruding portion 142a of the coating end end portion 142 are formed. Since the coating start end portion 141 has the protruding portion 141a and the coating end portion 142 has the protruding portion 142a, the width W12 of the coating start end portion 141 and the coating end portion 142 is coated in the X direction. It is larger than the width W2 of the central portion 143. Note that FIG. 18 emphasizes the relationship between the width W2 and the width W12 for the sake of explanation, and is not limited to this illustrated example.

Then, after the adhesive 4 is applied to one surface 11 on the X1 direction side or the X2 direction side by one plunger pump 211, the other side surface 11 on the X1 direction side or the X2 direction side is applied by the plunger pump 211. Adhesive 4 is applied to. Similarly, the adhesive 4 is applied to the surfaces 11 of the plurality of permanent magnets 1 by the same (one) plunger pump 211. That is, after the application of the adhesive 4 to the surface 11 of one permanent magnet 1 is completed, the adhesive 4 is applied to the surface 11 of another permanent magnet 1.

Further, after the application of the adhesive 4 to the surfaces 11 of the plurality of permanent magnets 1 placed on one pallet 215 is completed, another pallet 215 is placed below the plunger pump 211 by the conveyor 216 (see FIG. 9). Will be moved. Then, the adhesive 4 is applied to the surfaces 11 of the plurality of permanent magnets 1 placed on the moved pallet 215. Then, the process proceeds to step S2.

<Process to dry the adhesive>
In step S2 (see FIG. 13), a step of drying and thinning the adhesive 4 is performed. In the present embodiment, as shown in FIG. 8, by volatilizing the diluting solvent 44 of the adhesive 4, the thickness t11 of the coating start end portion 141 and the coating end end portion 142 is changed to the thickness t1 by the first reduction amount R1. Then, the thickness t12 of the coating central portion 143 of the adhesive 4 changes to the thickness t2 by the second reduction amount R2. In this state, the thickness of the adhesive 4 becomes substantially uniform. Specifically, as shown in FIG. 14, the adhesive 4 is heated to a temperature T10 having a drying temperature T3 or higher and an expansion temperature lower than T1. For example, the adhesive 4 is heated by giving hot air (air blow) in a heating furnace (not shown) or by heating the permanent magnet 1 with a heater or the like. After that, the process proceeds to step S3.

<Process of arranging permanent magnets>
In step S3 (see FIG. 13), as shown in FIG. 19, a step of inserting the permanent magnet 1 on which the dried adhesive 4 is arranged into the magnet hole 32 of the rotor core 3 is performed. Specifically, the rotor core 3 and the permanent magnet 1 in which the surface 11 on which the adhesive 4 is arranged are directed inward in the radial direction are moved relative to each other in the axial direction, thereby forming the holes 32 for magnets. , The permanent magnet 1 is inserted. Although only one permanent magnet 1 is shown in FIG. 19, the permanent magnet 1 is inserted into each of the magnet holes 32. Then, as shown in FIG. 7, the bottom portion 32d of the groove portion 32b of the magnet hole portion 32 and the adhesive 4 having the thickness t1 are in a state of being arranged at distant positions.

<Process of curing the adhesive>
In step S4 (see FIG. 13), a step of adhering the permanent magnet 1 and the rotor core 3 is performed by curing the main agent 42 and the curing agent 43 of the adhesive 4. Specifically, the adhesive 4 is heated to a temperature T11 (see FIG. 14) that is higher than the expansion temperature T1 and is equal to or higher than the curing temperature T2. For example, in the heating furnace, the adhesive 4 is heated to the temperature T11 with hot air. As a result, as shown in FIG. 5, the foaming agent 41 of the adhesive 4 expands due to foaming, and the thickness of the adhesive 4 changes from the thicknesses t1 and t2 to the thickness t3. Further, as shown in FIG. 4, the thickness t3 of the adhesive 4 is substantially equal to the distance from the surface 11 of the permanent magnet 1 to the bottom portion 32d of the groove portion 32b. That is, the adhesive 4 is in a state of being expanded from the surface 11 of the permanent magnet 1 to the bottom portion 32d of the groove portion 32b. Further, the adhesive 4 expands, the surface 13 of the permanent magnet 1 is pressed outward in the radial direction, and the wall surface 32a of the hole 32 for the magnet and the surface 13 of the permanent magnet 1 come into contact with each other.

Then, as the main agent 42 and the curing agent 43 of the adhesive 4 are cured, the permanent magnet 1 and the magnet hole portion 32 are fixed by the cured adhesive 4. After that, the rotor 100 is completed. Then, as shown in FIG. 1, the rotor 100 is assembled with the stator 102, and the rotary electric machine 101 is completed.

(Comparison result with rotor manufacturing method by comparative example)
Next, a comparison result between the method for manufacturing the rotor according to the comparative example and the method for manufacturing the rotor 100 according to the first embodiment will be described.

As shown in FIG. 20, in the rotor manufacturing method according to the comparative example, the distance between the nozzle and the coating surface of the permanent magnet is the second distance d12, the amount of the adhesive applied, and the moving speed of the nozzle are constant. , The adhesive was applied to the coated surface. Then, after the adhesive was dried, the thickness at each coating position was measured. Further, the thickness of the adhesive 4 formed by the method for manufacturing the rotor 100 according to the first embodiment was measured.

In the measurement result of the thickness of the adhesive of the comparative example shown in FIG. 21, the thickness in the vicinity of the coating start end portion P11 and the coating vicinity of the coating end portion P12 was larger than the thickness of the coating center portion. The variation width was e1.

On the other hand, as shown in FIG. 22, in the method for manufacturing the rotor 100 according to the first embodiment, the thicknesses (t1 and t2) of the adhesive 4 after drying are substantially uniform. Specifically, in the first embodiment, it was found that the variation width e2 is less than one-third of the variation width e1 of the manufacturing method according to the comparative example. That is, it was found that in the first embodiment, the thickness of the adhesive 4 can be made substantially uniform without using a press machine or the like.

[Rotor manufacturing method according to the second embodiment]
Next, a method of manufacturing the rotor 100 according to the second embodiment will be described with reference to FIGS. 23 and 24. In the rotor 100 according to the second embodiment, the adhesive 4 is applied to the surface 11 while changing the moving speed of the nozzle 313 in the Y direction while keeping the discharge amount of the adhesive 4 from the discharge port 313a constant. .. Further, in the following description, the same reference numerals will be given to the same structures as those in the first embodiment, and the description thereof will be omitted. That is, the rotor 100 has the same configuration as the rotor 100 according to the first embodiment.

As shown in FIG. 23, the coating device 301 of the second embodiment includes a nozzle 313. In the second embodiment, the nozzle 313 is arranged at a constant distance from the surface 11 of the permanent magnet 1 in the Z direction. Then, in the second embodiment, in step S11 (see FIG. 13), while changing the moving speed of the nozzle 313 in the Y direction while keeping the discharge amount of the adhesive 4 from the discharge port 313a of the nozzle 313 constant. , The adhesive 4 is applied to the surface 11.

As shown in FIG. 24, with the nozzle 313 arranged at the position P1, the adhesive 4 is started to be discharged from the discharge port 313a and is moved in the Y direction at the moving speed V1. As a result, the coating start end portion 141 having a thickness t11 is formed. Then, at the position P2, the moving speed of the nozzle 313 is reduced to a moving speed V2 lower than the moving speed V1, and the discharge of the adhesive 4 is continued, so that the coating central portion 143 having the thickness t12 is formed. NS. Further, at the position P3, the adhesive 4 is moved in the Y direction at the moving speed V1 while the discharge of the adhesive 4 is continued, so that the coating end portion 142 having the thickness t11 is formed. That is, the moving speed V1 corresponds to the thickness t11, and the moving speed V2 corresponds to the thickness t12.

After that, as shown in FIG. 8, the thickness t11 of the coating start end portion 141 and the coating end end portion 142 becomes t1 by drying the adhesive 4, as in the method for manufacturing the rotor 100 according to the first embodiment. Therefore, the thickness t12 of the coating central portion 143 becomes t2, which is equivalent to t1. The other manufacturing methods of the second embodiment are the same as those of the first embodiment.

[Rotor manufacturing method according to the third embodiment]
Next, a method of manufacturing the rotor 100 according to the third embodiment will be described with reference to FIGS. 23 and 25. In the rotor 100 according to the third embodiment, the adhesive 4 is applied to the surface 11 while changing the discharge amount of the adhesive 4 while keeping the moving speed of the nozzle 413 constant. Further, in the following description, the same reference numerals will be given to the same structures as those of the first and second embodiments, and the description thereof will be omitted. That is, the rotor 100 has the same configuration as the rotor 100 according to the first embodiment.

As shown in FIG. 23, the coating device 401 of the third embodiment includes a nozzle 413. In the embodiment, the nozzle 413 is arranged at a constant distance from the surface 11 of the permanent magnet 1 in the Z direction. Then, in the third embodiment, in step S21 (see FIG. 13), the discharge amount of the adhesive 4 from the discharge port 313a of the nozzle 313 is changed while the moving speed of the nozzle 313 in the Y direction is constant. The adhesive 4 is applied to the surface 11.

As shown in FIG. 25, the coating is started with the nozzle 413 arranged at the position P1 and the discharge amount of the adhesive 4 from the discharge port 413a is F1, and the nozzle 413 moves in the Y direction at a constant moving speed. Moved to. As a result, the coating start end portion 141 having a thickness t11 is formed. Then, at the position P2, the discharge amount from the nozzle 413 is set to the discharge amount F2 which is larger than that of F1. Then, the nozzle 413 is moved at a constant moving speed while the adhesive 4 is discharged from the nozzle 413, so that the coating central portion 143 having the thickness t12 is formed. Further, at the position P3, the discharge amount of the adhesive 4 is set to F1 and the adhesive 4 is moved in the Y direction at a constant moving speed to form the coating end end portion 142 having the thickness t11. That is, the discharge amount F1 corresponds to the thickness t11, and the discharge amount F2 corresponds to the thickness t12.

After that, as in the method for manufacturing the rotor 100 according to the first embodiment, the adhesive 4 is dried so that the thickness t11 of the coating start end portion 141 and the coating end end portion 142 becomes t1, and the coating center portion 143. The thickness t12 is t2, which is equivalent to t1. The other manufacturing methods of the third embodiment are the same as those of the first embodiment.

[Effects of the first to third embodiments]
In the first to third embodiments, the following effects can be obtained.

In the first to third embodiments, as described above, the direction orthogonal to the coating surface (11) of the coating end portions (141, 142) including the coating start end portion (141) and the coating end end portion (142). The first coating thickness (t11) of is the portion of the adhesive (4) between the coating start end (141) and the coating end (142), and the second coating thickness (143) of the coating center (143). The adhesive (4) is applied to the coated surface (11) so as to be smaller than t12). As a result, before the step of drying the adhesive (4), the thickness of the coating end portions (141, 142) (first coating thickness (t11)) is previously set to the thickness of the coating center portion (143) (second coating thickness). It can be made smaller than (t12)). As a result, in the step of drying the adhesive (4), the amount of decrease in thickness (R1) of the coated ends (141, 142) is between the coating start end (141) and the coating end (142). Since it is smaller than the reduction amount (R2) of the thickness of the coating center portion (143) which is the portion of the adhesive (4), the thickness (t1) of the coating end portions (141, 142) and the coating center portion (143) The difference from the thickness (t2) of can be reduced. As a result, in the dried adhesive (4), it is possible to prevent the thickness (t1) of the coated end portions (141, 142) and the thickness (t2) of the coated central portion (143) from becoming uneven. can. Further, in the above embodiment, since the step of drying the adhesive (4) is provided, a press machine is not required, and the thickness of the adhesive (4) is not large while preventing the rotor (100) from increasing in size. It can be prevented from becoming uniform. Further, since the thickness of the adhesive (4) is prevented from becoming uneven, the adhesive (4) is used when the permanent magnet (1) is inserted into the magnet hole (32) of the rotor core (3). It is possible to prevent the rotor core (3) or the permanent magnet (1) from interfering with each other.

Further, in the first to third embodiments, as described above, in the step of drying the adhesive (4), the coating end portion (141) is volatilized by volatilizing the volatile agent (44) of the adhesive (4). , 142), the first coating thickness (t11) is changed to the thickness (t1) after the first drying, and the second coating thickness (t12) of the coating central portion (143) of the adhesive (4) is changed after the second drying. The step of changing the thickness (t2), and the step of applying the adhesive (4), is the first reduction amount (R1) from the first coating thickness (t11) to the first post-drying thickness (t1), and the first. 2 Coating ends (141, 142) so that the first coating thickness (t11) corresponds to the difference from the second reduction amount (R2) from the second coating thickness (t12) to the second post-drying thickness (t2). This is a step of applying the adhesive (4) to the coating surface (11) corresponding to the above. With this configuration, the first coating thickness (t11) is the first reduction amount (R1) and the coating center portion (143) of the thickness of the coating end portions (141, 142) in the step of drying the adhesive (4). ) Is configured in a size that takes into consideration the second reduction amount (R2), so that the thickness (t1) of the coated end portions (141, 142) and the coating are applied in a dry state of the adhesive (4). The thickness (t2) of the central portion (143) can be made substantially uniform.

Further, in the first to third embodiments, as described above, in the step of applying the adhesive (4), the thickness (t1) after the first drying is equal to the thickness (t2) after the second drying. In addition, the coating surface (11) corresponding to the coating end portions (141, 142) has a first coating thickness (t11) corresponding to the difference between the first reduction amount (R1) and the second reduction amount (R2). ) Is a step of applying the adhesive (4). With this configuration, in the state where the adhesive (4) is dried, the thickness (t1) of the coated end portions (141, 142) after the first drying and the thickness of the coated central portion (143) after the second drying ( Since it is equivalent to t2), the thickness of the adhesive (4) can be made even more uniform.

Further, in the first embodiment, as described above, the step of applying the adhesive (4) includes a nozzle (213) having a discharge port (213a) for discharging the adhesive (4) and a nozzle (213). The nozzle (213) is moved in the direction orthogonal to the coating surface (11) by the coating device (201) including the moving mechanism portion (212) that moves the permanent magnet (1) with respect to the coating surface (11). Adhesive is applied to the coating surface (11) corresponding to the coating ends (141, 142) in a state where the coating surface (11) and the first coating thickness (t11) correspond to the first distance (d11). At the position where (4) is applied and the nozzle (213) is at a second distance (d12) corresponding to the coating surface (11) and the second coating thickness (t12) in the direction orthogonal to the coating surface (11). This is a step of applying the adhesive (4) to the coating surface (11) corresponding to the coating center portion (143) in the state of being arranged in. With this configuration, the tip portion (213a) of the nozzle (213) is moved by moving the nozzle (213) so as to change the distance between the nozzle (213) and the coating surface (11) of the coating device (201). , 213b) can come into contact with the surface of the adhesive (4) to change the thickness (t11, t12) of the adhesive (4), so that the coated ends (141, 142) having different thicknesses can be easily obtained. And the coating center portion (143) can be formed.

Further, in the first embodiment, in the step of applying the adhesive (4), the discharge amount of the adhesive (4) from the discharge port (213a) is kept constant, and the coating surface of the nozzle (213) is applied. This is a step of applying the adhesive (4) to the coating surface (11) by the coating device (201) in a state where the moving speed in the direction along (11) is constant. With such a configuration, it is possible to simplify the control of the discharge amount and the control of the moving speed of the nozzle (213), so that it is possible to prevent the control load of the coating device (201) from increasing.

Further, in the first embodiment, in the step of applying the adhesive (4), the amount of the adhesive (4) discharged from the discharge port (213a) is kept constant, and the nozzle (213) is applied. With the moving speed in the direction along the surface (11) constant, and with the nozzle (213) placed at the position of the first distance (d11), the applied adhesive (4) is applied to the nozzle (213). ) Is a step of applying the adhesive (4) to the coating surface (11) corresponding to the coating ends (141, 142) while protruding in the direction intersecting the moving direction. Here, when a wall portion is provided to prevent the adhesive discharged in the direction orthogonal to the moving direction of the discharge port from squeezing out, and the amount of the adhesive discharged from the discharge port is constant and the nozzle When the moving speed in the direction along the coating surface is kept constant, if the distance between the nozzle and the coating surface is reduced, the discharged adhesive will be left over, and the excess discharged adhesive will be removed from the nozzle. It is considered to move along the direction of movement. In this case, it is considered that the excess adhesive is further added to the portion having the first coating thickness, and the first coating thickness changes (increases). On the other hand, in the above embodiment, the applied adhesive (4) intersects the moving direction of the nozzle (213) with the nozzle (213) arranged at the position of the first distance (d11). Since it is squeezed out, it is possible to prevent the excess adhesive (4) from being added to the portion having the first coating thickness (t11). As a result, even when the discharge amount of the adhesive (4) from the discharge port (213a) is constant and the moving speed of the nozzle (213) in the direction along the coating surface (11) is constant. , The change (increase) of the first coating thickness (t11) due to the surplus adhesive (4) can be prevented. As a result, it is possible to prevent the thickness of the adhesive (4) from becoming uneven while preventing the control load of the coating device (201) from increasing.

Further, in the second and third embodiments, the step of applying the adhesive (4) includes a nozzle (313, 413) having a discharge port (313a, 413a) for discharging the adhesive (4), and a nozzle (313, 413). Adhesive from the discharge port (313a, 413a) by the coating device (301, 401) including the moving mechanism portion (212) that moves the permanent magnet (1) with respect to the coating surface (11) of the permanent magnet (1). With the discharge amount of (4) constant, the movement speeds (V1, V2) in the direction along the coating surface (11) of the nozzles (313, 413) were changed, or the movement speed was made constant. This is a step of applying the adhesive (4) to the coated surface (11) while changing the discharge amount (F1, F2) of the adhesive (4) in this state. With this configuration, the thickness of the adhesive (4) can be reduced by increasing the moving speed, and the thickness of the adhesive (4) can be increased by decreasing the moving speed. Therefore, the coating end portions (141, 142) and the coating center portion (143) having different thicknesses can be easily formed while continuously moving the nozzles (313, 413). Further, by changing the discharge amount of the adhesive (4) while keeping the moving speed constant, the coating ends (applied ends having different thicknesses) can be easily moved while moving the nozzles (313, 413) at a constant speed. 141, 142) and the coating center (143) can be formed.

Further, in the first to third embodiments, in the step of applying the adhesive (4), the adhesive (4) containing the expander (41) that expands when heated to the expansion temperature (T1) or higher is applied. , The step of applying to the coated surface (11) so that the first coating thickness (t11) is smaller than the second coating thickness (t12), and the step of curing the adhesive (4) is the adhesive (4). ) Is heated to an expansion temperature (T1) or higher to expand the expansion agent (41) and cure the adhesive (4). With this configuration, even if the thickness of the adhesive (4) is once reduced by the step of drying the adhesive (4), the thickness of the adhesive (4) can be increased by the swelling agent (41). Therefore, with the gap between the magnet hole (32) and the permanent magnet (1) filled with the expanded adhesive (4), the magnet hole (32) and the permanent magnet (1) can be separated. Can be glued.

[Modification example]
It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims.

For example, in the above embodiment, an example in which the rotor is configured as a so-called inner rotor in which the rotor is arranged inside the stator in the radial direction is shown, but the present invention is not limited to this. That is, the rotor may be configured as an outer rotor.

Further, in the above embodiment, an example in which the adhesive is applied to the permanent magnet is shown, but the present invention is not limited to this. That is, the adhesive may be applied to the holes for magnets.

Further, in the above embodiment, as shown in FIG. 8, an example in which the thickness of the coating start end portion and the coating end end portion are coated with a constant size is shown, but the present invention is not limited to this. For example, as in the method of manufacturing a rotor of the modified example shown in FIG. 26, the thickness of the coating start end portion and the coating end end portion may be formed in a slope shape that decreases from t22 to t21.

Further, in the above embodiment, an example in which a foaming agent is used as a leavening agent is shown, but the present invention is not limited to this. For example, a expanding material other than the foaming agent may be used as the expanding agent.

Further, in the above embodiment, an example (see FIG. 4) in which the adhesive is arranged on the surface 11 of the permanent magnet is shown, but the present invention is not limited to this. For example, the adhesive may be placed on the surface 12 of the permanent magnet, or may be provided on both the surface 11 and the surface 12.

Further, in the above embodiment, an example in which the adhesive is applied while moving the plunger pump relative to the permanent magnet is shown, but the present invention is not limited to this. For example, the adhesive may be applied while moving the permanent magnet relative to the plunger pump.

1 Permanent magnet 3 Rotor core 4 Adhesive 11 surfaces (coated surface)
32 Magnet hole 41 Foaming agent (expansion agent)
44 Diluting solvent (volatile agent) 100 Rotor 141 Application start end (application end) 142 Application end end (application end)
143 Coating center 201, 301, 410 Coating device 212 3-axis Cartesian robot (moving mechanism) 213, 313, 413 Nozzles 213a, 313a, 413a Discharge port d1 First distance d2 Second distance t1 First drying thickness t2 First 2 Thickness after drying t11 First coating thickness t12 Second coating thickness R1 First reduction amount R2 Second reduction amount

Claims (6)

A method for manufacturing a rotor including a rotor core having a magnet hole and a permanent magnet arranged in the magnet hole and adhered to the rotor core with an adhesive.
A step of applying the adhesive containing a volatile agent to the coated surface of the permanent magnet or the rotor core to which the adhesive is applied, and
After the step of applying the adhesive, the adhesive is heated at a temperature lower than the curing temperature of the adhesive to volatilize at least a part of the volatile agent of the adhesive and dry the adhesive. Process and
After the step of drying the adhesive, a step of arranging the permanent magnet in the hole for the magnet and a step of arranging the permanent magnet.
After the step of arranging the permanent magnet, a step of curing the adhesive is provided.
The step of applying the adhesive is the coating of the coating end portion including the coating start end portion including the position where the application of the adhesive is started and the coating end portion including the position where the application of the adhesive is finished. The first coating thickness in the direction orthogonal to the surface is smaller than the second coating thickness of the coating center portion, which is the portion of the adhesive between the coating start end portion and the coating end end portion. step der applying the adhesive to the coated surface is, and includes a nozzle having a discharge port for discharging the adhesive, and a moving mechanism for moving the nozzle relative to the coated surface of the permanent magnet The coating corresponding to the coating end portion is provided by the coating device in a state where the nozzle is arranged at a position at a position corresponding to the coating surface and the first coating thickness in a direction orthogonal to the coating surface. The adhesive is applied to the surface, and the nozzle is arranged at a position at a second distance corresponding to the coating surface and the second coating thickness in a direction orthogonal to the coating surface, and the coating center. This is a step of applying the adhesive to the coated surface corresponding to the portion.
In the step of drying the adhesive, the thickness of the first coating end portion is changed to the thickness after the first drying by reducing the first coating thickness by the first reduction amount by volatilizing the volatile agent of the adhesive. At the same time, by reducing the second coating thickness of the coating central portion of the adhesive by a second reduction amount larger than the first reduction amount, the thickness is changed to the same post-drying thickness as the first drying thickness. A method of manufacturing a rotor, which is a process of forming a rotor. Applying a pre-SL adhesive, said first amount of reduction from the first coating thickness to the first thickness after drying, the second decrease amount from the second application thickness to said second thickness after drying The method for manufacturing a rotor according to claim 1, which is a step of applying the adhesive to the coating surface corresponding to the coating end portion so as to have the first coating thickness corresponding to the difference from the above. In the step of applying the adhesive, the first coating corresponding to the difference between the first reduction amount and the second reduction amount so that the thickness after the first drying becomes equivalent to the thickness after the second drying. The method for manufacturing a rotor according to claim 2, which is a step of applying the adhesive to the coated surface corresponding to the coated end portion so as to have a thickness. In the step of applying the adhesive, the coating is carried out in a state where the amount of the adhesive discharged from the discharge port is constant and the moving speed of the nozzle in the direction along the coating surface is constant. The method for manufacturing a rotor according to any one of claims 1 to 3, which is a step of applying the adhesive to the coated surface by an apparatus. The step of applying the adhesive is described in a state where the amount of the adhesive discharged from the discharge port is constant and the moving speed of the nozzle in the direction along the coating surface is constant. With the nozzle arranged at the position at the first distance, the applied adhesive is projected onto the coated surface corresponding to the coated end portion while protruding in a direction intersecting the moving direction of the nozzle. The method for manufacturing a rotor according to claim 4 , which is a step of applying the above. In the step of applying the adhesive, the coating surface of the adhesive containing a leavening agent that expands when heated to an expansion temperature or higher is applied so that the first coating thickness is smaller than the second coating thickness. It is a process of applying to
The step of curing the adhesive is a step of expanding the expansion agent and curing the adhesive by heating the adhesive to a temperature equal to or higher than the expansion temperature, which is any one of claims 1 to 5. The method for manufacturing a rotor according to the section.

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